But God is truth itself: 'I am the way, the truth, and the life' ( John 14:6) Therefore 'God exists' is self-evident.

For whoever denies the existence of truth grants that truth does not exist: and, if truth does not exist, then the proposition ' Truth does not exist' is true: and if there is anything true, there must be truth. Further, the existence of truth is self-evident. Therefore the proposition 'God exists' is self-evident. Therefore, since as soon as the word 'God' is understood it exists mentally, it also follows that it exists actually. But that which exists actually and mentally is greater than that which exists only mentally. For by this word is signified that thing than which nothing greater can be conceived. But as soon as the signification of the word 'God' is understood, it is at once seen that God exists. Thus, when the nature of a whole and of a part is known, it is at once recognized that every whole is greater than its part. iii) says is true of the first principles of demonstration. Further, those things are said to be self-evident which are known as soon as the terms are known, which the Philosopher (1 Poster. i, 1,3), 'the knowledge of God is naturally implanted in all.' Therefore the existence of God is self-evident. Now those things are said to be self-evident to us the knowledge of which is naturally implanted in us, as we can see in regard to first principles. It seems that the existence of God is self-evident. Whether the existence of God is self-evident?

Is the proposition 'God exists' self-evident?Īrticle 1.

Aquinas summa theologica